Knife sharpener device



Oct. 16, 1934. G, W|NKLER 1,977,418

KNIFE SHAHPENER DEVICE Fild Oct. 21, 1950 I lllllllllll m INVENTORHERMAN 6. WIN/(LE8.

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Patented Oct. 16, 1934 *UNiTED STATES kNiFE SHARIENERDEVICE:

Herman G. Winkler, Detroit, Mich.,"assignor to Barnes Scale Company,Detroit, Mich., a corporation of Michigan Application October 21, 1930,Serial No. 490,260

1 Claim. (01. 51- -248) ;This invention has to do with a knife sharpenerdevice and particularly to a sharpener construction for use with arotary knife, as most generallyemployed in slicing machines.

-While sharpeners for slicing machine disc knives are old, the presentinvention is directed towards the provision of a simplified construc--tion, particularly as regards the mounting and controlmechanism .fortwo opposed sharpener One of these elements is primarily a grindingelement; the other one for removing the burr on the cutting edge of theknife. A particular feature of the invention resides in the dispositionof the burr-removing element, and the direction of movement of thiselement, having due regard to the point on the element, or place on theelement, which contacts with the disc knife. More specifically, theburr-removing element is arranged so that the part thereof whichcontacts with the knife has a movement which is inwardly of the knife;in other words, at the point of contact of the burr-removing elementwith the knife the burr-removing element is moving across the edge ofthe knife from Without its periphery to within its periphery.

Fig. 1 is substantially a top plan view of the sharpeners, with thehousing shown in section.

Fig. 2 is a section taken on line 33 of Fig. 2 illustrating theburr-removing element.

Fig. 3 is a section taken on line 4-4 of Fig. 1 illustrating thegrinding element.

Fig. 4 shows diagrammatical illustrations of the two elements contactingwith the knife.

A housing 4 of a slicing machine for housing a 5 a disc knife and inwhich the disc knife may be journaled may be of one piece castingconstruction and formed with a recess as at the recess is interior, abulge appearing on the exterior and in this recess the sharpener con- 40struction, at least in part, is disposed. The Sharpeners comprise anabrading element and a burr-removing element arranged to engageopposite' sides of the cutting edge and these elemerits are mounted in aunitary or assembled a manner. There is a bracket which may be in theform of a plate 11 adapted to be secured to the slicing machine as, forexample, within the housing 10, and for this purpose the housing isprovided with studs 12 for the reception of This plate has tubularmembers 15 and 16 for housing the spindles of the sharpener elements. Asshown in Fig. 1, these tubular elements are arranged angularly asregards the plane of the disc so that the sharpener elements, includingboth the abrasive element and the burr-removing'element, properly.engage the knife. This will-be. explained more in detail later on.

The abrasive element is shown at 20 and by means of a screw 21 isfastened to a spindle 22. m This spindle is located within a sleeve 23closed at one end by a cap .24 screw threaded thereon with a thrustbearing 25 on the end of the spindle 22 held by means of a screw 26. Acoil spring 27 is located between the cap and the end of the tubularelement 15 while the cap itself has a projection 28 provided with a head29.

It will be noted that the assembly of the spindle, sleeve, thrustwasher, spring and so forth, are located inthe tubular member 15 andthat the 7Q spindle and sleeve are axially shiftable and are acted uponby the spring 2'7. At the same time, the abrasive element and spindle 22are rotatable irra sleeve 23.

The burr-removing element as shown at 30 is mounted in tubular element16 by means of a spindle 31 upon which the element may be threaded, thespindle being within a sleeve 32 shiftable axially in tubular member 16and acted upon by coil spring 33, there being a thrust bearing 34 on theend of the spindle held by screw 35. A cap 36 closes over the bearing.Accordingly, it will be noted that element 30 and its spindle may rotateyet shift axially with sleeve 32.

The two elements are made shiftable by a single control and for thispurpose there is a rocker member or lever 40 fulcrumed upon a screw 41mounted in the plate 11 and adjustable therein upon its screw threadsand capable of being held in adjustment by a nut 42. The lever 40 hasforked ends 43 which engage under enlargements 29 and 44 of the abrasiveunit (Figs. 2 and 3). An adjusting screw is shown at 45, the screw beingthreaded into the housing 10 having an knurled head 46.

As the screw 45 is rotated one way or another, the rocker member 40 isrocked. Let us assume that the screw 45 is screwed inwardly of thehousing, viewing Fig. 1; this shifts the burr-removing element fromright to left (Fig.

2) thus compressing spring 33; it also shifts the abrasive element fromleft to right (Fig. 3) against action of the spring 27 due to the factthat the forked end of the lever 40 lies under .105 head 29. Inasmuch asthe disc knife is located between these elements, each draws away fromthe knife in this action.

To bring the sharpener elements into place the screw 45 is backed away;the spring 33 T10 thus urges the burr-removing element 30 against oneside of the knife, the spring 27 urges the abrasive element 20 againstthe other side of the knife.

In Fig. 4 there is a diagrammatic showing illustrating the arrangementof the parts. The abrasive element, due to its angular disposition,engages the knife substantially at the point at. The knife is rotatingcounter-clockwise as indicated by the arrow and the abrasive element 20is also given a counter-clockwise rotation due to its frictional contactat point :0 with the knife. By reference to Fig. 1, it will be notedthat the burr-removing element 30 is located at an angle or rather in aplane which is slightly angular as regards the plane of the knife; thearrangement is such that the knife and the burrremoving element engagesubstantially at the point 1). The burr-removing element, due to itsfrictional contact at 12 with the knife is given a clockwise directionof rotation. It will be noted therefore that at-the point of contactwith the knife the burr-removing member is moving inwardly; that is tosay, across the cutting edge of the knife exteriorly thereof toward theinterior .of the knife or in a general direction toward the center ofthe knife. With this sort of action the small burrs on the edge of theknife are engaged and bent at a sharp angle .upon themselves with theresult that they are broken off. A better understanding may be had if itbe pictured that the burr-removing element is rotated in the oppositedirection; this action would cause the burrs merely to straighten outand project from the cutting edge of the knife rather than by bendingdown along the face of the knife to be broken off.

It is feasible and within the invention to mount the sharpeners asdescribed herein and provide them with positive rotation while, as shownherein, the sharpener elements are merely idlers and get their rotationfrom their frictional engagement with the knife.

I claim:

A sharpener structure for a rotary disk knife comprising, an abradingmember, a burr-removing member, said members being disposed on oppositesides of the knife near its edge, each of said members being mounted forrotation upon a fixed axis, a spring acting upon each member normallytending to urge each member oppositely as regards the other and intoengagement with the knife, a manually operable screw threaded controlmember disposed substantially on the axis of one of the sharpenermembers and adapted to shift the said one sharpening member out ofengagement with the knfe against the action of the spring actingthereon, a rocker arm interconnecting the two sharpening members, and anadjustable screw threaded fulcrum for the rocker member disposed betweenthe two sharpening members whereby the said manually operable member inshifting one sharpening element away from the knife edge against theaction of the spring acting thereon effects shiftingof the othersharpening element but in an opposite direction away from the knife edgethroughthe means of said rocker. arm. HERMAN G. WINKLER.

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